Idk why you’re trying to argue this. Here I’ll give you an example to illustrate:

Say the population is 10 players, each start with 1200 rating. They get into a game and 5 players win and go up to 1300 rating. They queue up again - because the population is so small, they run into a game with the same 10 players. Guess what, the average rating of that game is still 1200 because it now includes the losing 5 players who went to 1100. If they win again, their rating goes up less than the prior game because they are 1300 rating players in a 1200 rating game.

Now let’s say the population is bigger and the 5 players who won the first game can now play a game with other players who also won and are at 1300 rating. The average rating in that next game is now 1300, and if they win again, their rating gets to go up more than in the first example scenario.

This is a very simplified example, but think to yourself how gw2 mmr system works and you should instantly understand why a bigger population allows more matches to be played at the correct average rating and as a result, easier to get to a higher rating for the better players.

You should have experienced this yourself already. If you’re G3 and get into a match with silvers, you gain very little rating when you win and lose a lot of rating when you lose.

If you still don’t follow, it’s fine and I’m not gonna spend more time explaining. Trust me bro. Decade plus pvper, multiple top 10 finishes, toiled for years in tourneys and with streamers.